An in-depth study of a healthy 89-year-old man who has smoked two packs of cigarettes a day for more than 60 years is intended to reveal universal principles related to the effects of smoking on health. however, the man is atypical. this illustrates a weakness of which method of descriptive research?

A weakness of Case study research method. Case study is a detailed research strategy that focuses on a subject (the case), and all its related contextual conditions and complexities. It rises or falls with the subject because an average, or atypical case, is often not the richest source of information. There's always exceptions to everything. Since it has been proven that cigarettes kill, an 89 years old chronic smoker who has lived longer than expected would flaw the reasearch. This is obviously one of the main weakness of case study research method. If one or two subjects defy all odds that is no reason to base our assumptions/conclusions on that. It is certainly not in the researcher's best interest to gauge certain qualities, attributes, or expectations based on a particular case. Case study research method usually analyzes, scrutinizes and draws conclusions from a subject which is often inaccurate; drawing conclusions from a sample of hundreds and even thousands using one or two is often far from the main result.

Asolar eclipse occurs when the moon gets between earth and the sun, and the moon casts a shadow over earth. a solar eclipse can only take place at the phase of new moon, when the moon passes directly between the sun and earth and its shadows fall upon earth's surface.

The answer is a. i think